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Is there a way to get Shells by Z-Order? [message #1702308]

Tue, 21 July 2015 13:28

Eclipse User

If there are more than one Shell for a Display,
some Shells could cover others,
I want to get all Shells by Z-Order: Top first.
Is there a way?

Thanks.

Frank

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Re: Is there a way to get Shells by Z-Order? [message #1702348 is a reply to message #1702308]

Tue, 21 July 2015 16:17

Brian de Alwis

Messages: 877
Registered: January 2012

Senior Member

I don't see a portable way of accomplishing this. You can determine what is the top element (Display#getActiveShell()). You might be lucky and find Display#getShells() returns the shells in Z-order, but it's not listed as a feature on its doc.

What are you trying to accomplish?

Brian.

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Re: Is there a way to get Shells by Z-Order? [message #1702668 is a reply to message #1702348]

Fri, 24 July 2015 00:15

Eclipse User

"Brian de Alwis" <forums-noreply@xxxxxxxx> 写入消息
news:molrbj$nf0$1@xxxxxxxxe.org...
> I don't see a portable way of accomplishing this. You can determine what
> is the top element (Display#getActiveShell()). You might be lucky and
> find Display#getShells() returns the shells in Z-order, but it's not
> listed as a feature on its doc.
>
> What are you trying to accomplish?
>

Well, since DND does not support dragging position (for drawing a rectangle
just like eclipse does), I implement myDND.
When dragging, I try to count which shell and which composite (with
ImyDropTarget interface) is dragover by mouse.
If shells are not covered to each other, I can get right shell & right
composite,
but if any shell(s) are covered to other(s), I cannot get right shell (and
neither right composite) sometimes.
That's why I need to get shells by Z-order.

Frank

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Re: Is there a way to get Shells by Z-Order? [message #1702972 is a reply to message #1702668]

Mon, 27 July 2015 15:35

Brian de Alwis

Messages: 877
Registered: January 2012

Senior Member

So it sounds like you're trying to reproduce something like how Eclipse draws a rectangle to preview the expected drop location when dragging views/editors around the workbench window? That functionality is all accomplished using SWT DND. You can see the implementation in the "dndaddon" found at:

https://git.eclipse.org/c/platform/eclipse.platform.ui.git/tree/bundles/org.eclipse.e4.ui.workbench.addons.swt/src/org/eclipse/e4/ui/workbench/addons/dndaddon

Brian.

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Re: Is there a way to get Shells by Z-Order? [message #1703154 is a reply to message #1702972]

Wed, 29 July 2015 02:41

Eclipse User

"Brian de Alwis" <forums-noreply@xxxxxxxx> 写入消息
news:mp5j34$f7d$1@xxxxxxxxe.org...
> So it sounds like you're trying to reproduce something like how Eclipse
> draws a rectangle to preview the expected drop location when dragging
> views/editors around the workbench window? That functionality is all
> accomplished using SWT DND. You can see the implementation in the
> "dndaddon" found at:
>
> https://git.eclipse.org/c/platform/eclipse.platform.ui.git/tree/bundles/org.eclipse.e4.ui.workbench.addons.swt/src/org/eclipse/e4/ui/workbench/addons/dndaddon
>
> Brian.

Thanks

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